Can you find out the missing number in the grid?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

What has one eye, but can’t see?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I know a nine-letter word having only one vowel.
Do you ?

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?

What has many teeth, but cannot bite?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

What goes up but never comes down?